Consumer Reports, Protect Your Credit Report Rights.
Many consumers don’t take advantage of their right to access their credit reports. Even if they do, they may still fall prey to the sale of add-on items.

Consumer Financial Protection Bureau: What do I do if I think I have been a victim of identity theft?.
Includes links and phone number to place fraud alerts with all three major credit reporting agencies. Explains initial (90 day) and extended (7 year) fraud alerts, security freezes, and active duty alerts for military.